The white mark on each knob should be pointing down. Connect the power cord to the back of the base. The base should be set on a hard surface, like a countertop table. Plug the other end of the power cord into standard outlet. Make sure the outlet is safe and the power cord is not twisted.Flip the power switch on the right side of the base. The line (-) indicates on and the circle (o) indicates off. Warning: Be careful with the hotplate turned on. Do NOT touch the aluminum surface as it gets very hot and can cause severe burns. The item "Laboratory Magnetic Stirrer Hotplate 12cm x 12cm with Stirring Rod Plating Lab" is in sale since Tuesday, September 27, 2016. This item is in the category "Business & Industrial\Healthcare, Lab & Life Science\Lab Equipment\Stirrers". The seller is "bestjewelrysupply" and is located in San Diego, California. This item can be shipped worldwide.